db7ae8a52bed1a7b40a8d2f307a901119ef79091
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "error.h"
17 #include "crypt.h"
18 #include "audiod.cmdline.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "ggo.h"
22 #include "recv.h"
23 #include "buffer_tree.h"
24 #include "filter.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
27 #include "client.h"
28 #include "audiod.h"
29 #include "net.h"
30 #include "daemon.h"
31 #include "string.h"
32 #include "fd.h"
33 #include "write.h"
34 #include "write_common.h"
35 #include "signal.h"
36
37 /** define the array of error lists needed by para_audiod */
38 INIT_AUDIOD_ERRLISTS;
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44 /** pointer to the receiver for this audio format */
45 struct receiver *receiver;
46 /** the receiver configuration */
47 void *receiver_conf;
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_filters;
50 /** Array of filter numbers to be activated. */
51 unsigned *filter_nums;
52 /** Pointer to the array of filter configurations. */
53 void **filter_conf;
54 /** the number of filters that should be activated for this audio format */
55 unsigned int num_writers;
56 /** Array of writer numbers to be activated. */
57 int *writer_nums;
58 /** pointer to the array of writer configurations */
59 void **writer_conf;
60 /** do not start receiver/filters/writer before this time */
61 struct timeval restart_barrier;
62 };
63
64 /**
65 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66 * be associated with a receiver/filter/writer triple. This array holds all
67 * information on the status of these slots.
68 *
69 * \sa struct slot_info
70 * */
71 struct slot_info slot[MAX_STREAM_SLOTS];
72
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75 /** Whether the 'N' flag is set. */
76 VSS_STATUS_FLAG_NEXT = 1,
77 /** The 'P' flag is set. */
78 VSS_STATUS_FLAG_PLAYING = 2,
79 };
80
81 /**
82 * The task for obtaining para_server's status (para_client stat).
83 *
84 * \sa struct task, struct sched.
85 */
86 struct status_task {
87 /** The associated task structure of audiod. */
88 struct task task;
89 /** Client data associated with the stat task. */
90 struct client_task *ct;
91 /** Do not restart client command until this time. */
92 struct timeval restart_barrier;
93 /** Last time we received status data from para_server. */
94 struct timeval last_status_read;
95 /** The offset value announced by para_server. */
96 int offset_seconds;
97 /** The length of the current audio file as announced by para_server. */
98 int length_seconds;
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 };
114
115 /** The array of status items sent by para_server. */
116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
117
118 /**
119 * the current mode of operation of which can be changed by the on/off/cycle
120 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
121 */
122 int audiod_status = AUDIOD_ON;
123
124 /**
125 * the gengetopt args_info struct that holds information on all command line
126 * arguments
127 */
128 struct audiod_args_info conf;
129
130 static char *socket_name;
131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
132
133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
134
135 static struct status_task status_task_struct;
136
137 /**
138 * the task that calls the status command of para_server
139 *
140 * \sa struct status_task
141 */
142 static struct status_task *stat_task = &status_task_struct;
143 static struct timeval initial_delay_barrier;
144
145 /**
146 * the task for handling audiod commands
147 *
148 * \sa struct task, struct sched
149 */
150 struct command_task {
151 /** the local listening socket */
152 int fd;
153 /** the associated task structure */
154 struct task task;
155 };
156
157 /** iterate over all supported audio formats */
158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
159
160 /**
161 * get the audio format number
162 * \param name the name of the audio format
163 *
164 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
165 * \a name is not a supported audio format.
166 */
167 int get_audio_format_num(const char *name)
168 {
169 int i;
170
171 while (para_isspace(*name))
172 name++;
173 FOR_EACH_AUDIO_FORMAT(i)
174 if (!strcmp(name, audio_formats[i]))
175 return i;
176 return -E_UNSUPPORTED_AUDIO_FORMAT;
177 }
178
179 char *get_time_string(int slot_num)
180 {
181 int ret, seconds = 0, length;
182 struct timeval *tmp, sum, sss, /* server stream start */
183 rstime, /* receiver start time */
184 wstime, /* writer start time */
185 wtime, /* now - writer start */
186 rskip; /* receiver start - sss */
187 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
188 char *msg;
189
190 if (audiod_status == AUDIOD_OFF)
191 goto empty;
192 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
193 if (stat_task->length_seconds) /* paused */
194 return NULL;
195 goto empty; /* stopped */
196 }
197 if (audiod_status == AUDIOD_ON && !s)
198 goto empty;
199 /* valid status items and playing */
200 if (s && s->wns) { /* writer active in this slot */
201 length = s->seconds_total;
202 tmp = &s->server_stream_start;
203 } else { /* standby mode, rely on status items */
204 length = stat_task->length_seconds;
205 tmp = &stat_task->server_stream_start;
206 }
207 if (stat_task->sa_time_diff_sign > 0)
208 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
209 else
210 tv_add(tmp, &stat_task->sa_time_diff, &sss);
211 if (!s || !s->wns) {
212 struct timeval diff;
213 tv_diff(now, &sss, &diff);
214 seconds = diff.tv_sec + stat_task->offset_seconds;
215 goto out;
216 }
217 btr_get_node_start(s->wns[0].btrn, &wstime);
218 tv_diff(now, &wstime, &wtime);
219 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
220 seconds = s->offset_seconds;
221 btr_get_node_start(s->receiver_node->btrn, &rstime);
222 ret = tv_diff(&rstime, &sss, &rskip);
223 if (ret > 0) { /* audiod was started in the middle of the stream */
224 tv_add(&wtime, &rskip, &sum);
225 seconds += sum.tv_sec;
226 } else
227 seconds += wtime.tv_sec;
228 out:
229 seconds = PARA_MIN(seconds, length);
230 seconds = PARA_MAX(seconds, 0);
231 msg = make_message(
232 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
233 s? "" : "~",
234 seconds / 60,
235 seconds % 60,
236 (length - seconds) / 60,
237 (length - seconds) % 60,
238 length? (seconds * 100 + length / 2) / length : 0,
239 length / 60,
240 length % 60
241 );
242 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
243 return msg;
244 empty:
245 return para_strdup(NULL);
246 }
247
248 static int want_colors(void)
249 {
250 if (conf.color_arg == color_arg_no)
251 return 0;
252 if (conf.color_arg == color_arg_yes)
253 return 1;
254 if (conf.logfile_given)
255 return 0;
256 return isatty(STDERR_FILENO);
257 }
258
259 static void parse_config_or_die(void)
260 {
261 int ret;
262 char *config_file;
263 struct audiod_cmdline_parser_params params = {
264 .override = 0,
265 .initialize = 0,
266 .check_required = 1,
267 .check_ambiguity = 0,
268 .print_errors = 1
269 };
270
271 if (conf.config_file_given)
272 config_file = para_strdup(conf.config_file_arg);
273 else {
274 char *home = para_homedir();
275 config_file = make_message("%s/.paraslash/audiod.conf", home);
276 free(home);
277 }
278 ret = file_exists(config_file);
279 if (conf.config_file_given && !ret) {
280 PARA_EMERG_LOG("can not read config file %s\n", config_file);
281 goto err;
282 }
283 if (ret)
284 audiod_cmdline_parser_config_file(config_file, &conf, &params);
285 free(config_file);
286 daemon_set_loglevel(conf.loglevel_arg);
287 return;
288 err:
289 free(config_file);
290 exit(EXIT_FAILURE);
291 }
292
293 static void setup_signal_handling(void)
294 {
295 sig_task->fd = para_signal_init();
296 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
297 para_install_sighandler(SIGINT);
298 para_install_sighandler(SIGTERM);
299 para_install_sighandler(SIGHUP);
300 para_sigaction(SIGPIPE, SIG_IGN);
301 }
302
303 static void clear_slot(int slot_num)
304 {
305 struct slot_info *s = &slot[slot_num];
306
307 PARA_INFO_LOG("clearing slot %d\n", slot_num);
308 memset(s, 0, sizeof(struct slot_info));
309 s->format = -1;
310 }
311
312 static void close_receiver(int slot_num)
313 {
314 struct slot_info *s = &slot[slot_num];
315 struct audio_format_info *a;
316
317 if (s->format < 0 || !s->receiver_node)
318 return;
319 a = &afi[s->format];
320 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
321 audio_formats[s->format], slot_num);
322 a->receiver->close(s->receiver_node);
323 btr_free_node(s->receiver_node->btrn);
324 free(s->receiver_node);
325 s->receiver_node = NULL;
326 stat_task->current_audio_format_num = -1;
327 }
328
329 static void writer_cleanup(struct writer_node *wn)
330 {
331 struct writer *w = writers + wn->writer_num;
332
333 w->close(wn);
334 btr_free_node(wn->btrn);
335 }
336
337 static void close_writers(struct slot_info *s)
338 {
339 struct audio_format_info *a;
340 int i;
341
342 if (s->format < 0)
343 return;
344 a = afi + s->format;
345 if (a->num_writers == 0)
346 writer_cleanup(s->wns);
347 else {
348 for (i = 0; i < a->num_writers; i++)
349 writer_cleanup(s->wns + i);
350 }
351 free(s->wns);
352 s->wns = NULL;
353 }
354
355 static void _close_filters(struct slot_info *s)
356 {
357 int i;
358 struct audio_format_info *a = afi + s->format;
359 if (a->num_filters == 0)
360 return;
361 for (i = 0; i < a->num_filters; i++) {
362 struct filter_node *fn = s->fns + i;
363 struct filter *f = filters + fn->filter_num;
364
365 f->close(fn);
366 btr_free_node(fn->btrn);
367 }
368 free(s->fns);
369 s->fns = NULL;
370 }
371
372 static void kill_all_decoders(int error)
373 {
374 int i, j;
375
376 FOR_EACH_SLOT(i) {
377 struct slot_info *s = &slot[i];
378 struct audio_format_info *a;
379 if (s->format < 0)
380 continue;
381 a = afi + s->format;
382 if (s->wns)
383 for (j = 0; j < a->num_writers; j++)
384 s->wns[j].task.error = error;
385 if (s->fns)
386 for (j = 0; j < a->num_writers; j++)
387 s->fns[j].task.error = error;
388 if (s->receiver_node)
389 s->receiver_node->task.error = error;
390 }
391 }
392
393 static int get_empty_slot(void)
394 {
395 int i;
396 struct slot_info *s;
397
398 FOR_EACH_SLOT(i) {
399 s = &slot[i];
400 if (s->format < 0) {
401 clear_slot(i);
402 return i;
403 }
404 if (s->wns || s->receiver_node || s->fns)
405 continue;
406 clear_slot(i);
407 return i;
408 }
409 return -E_NO_MORE_SLOTS;
410 }
411
412 /**
413 * get the number of filters
414 *
415 * \param audio_format_num the number identifying the audio format
416 *
417 * \return the number of filters for the given audio format
418 *
419 * \sa struct filter;
420 */
421 int num_filters(int audio_format_num)
422 {
423 return afi[audio_format_num].num_filters;
424 }
425
426 static void open_filters(struct slot_info *s)
427 {
428 struct audio_format_info *a = afi + s->format;
429 struct filter_node *fn;
430 int nf = a->num_filters;
431 struct btr_node *parent;
432 int i;
433
434 if (nf == 0)
435 return;
436 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
437 assert(s->fns == NULL);
438 s->fns = para_calloc(nf * sizeof(struct filter_node));
439 parent = s->receiver_node->btrn;
440 for (i = 0; i < nf; i++) {
441 struct filter *f = filters + a->filter_nums[i];
442 fn = s->fns + i;
443 fn->filter_num = a->filter_nums[i];
444 fn->conf = a->filter_conf[i];
445 fn->task.pre_select = f->pre_select;
446 fn->task.post_select = f->post_select;
447 fn->btrn = btr_new_node(f->name, parent, f->execute, fn);
448 f->open(fn);
449 register_task(&fn->task);
450 parent = fn->btrn;
451 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
452 audio_formats[s->format], i, nf, f->name, s - slot);
453 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
454 }
455 }
456
457 static void open_writers(struct slot_info *s)
458 {
459 int i;
460 struct audio_format_info *a = afi + s->format;
461 struct writer_node *wn;
462 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
463
464 assert(s->wns == NULL);
465 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
466 * sizeof(struct writer_node));
467 if (a->num_writers == 0)
468 setup_writer_node(NULL, parent, s->wns);
469 else {
470 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
471 for (i = 0; i < a->num_writers; i++) {
472 wn = s->wns + i;
473 wn->conf = a->writer_conf[i];
474 wn->writer_num = a->writer_nums[i];
475 register_writer_node(wn, parent);
476 }
477 }
478 s->server_stream_start = stat_task->server_stream_start.tv_sec?
479 stat_task->server_stream_start : *now;
480 s->offset_seconds = stat_task->offset_seconds;
481 s->seconds_total = stat_task->length_seconds;
482 }
483
484 /* returns slot num on success */
485 static int open_receiver(int format)
486 {
487 struct audio_format_info *a = &afi[format];
488 struct slot_info *s;
489 int ret, slot_num;
490 struct receiver *r = a->receiver;
491 struct receiver_node *rn;
492 const struct timeval restart_delay = {2, 0};
493
494 ret = get_empty_slot();
495 if (ret < 0)
496 goto err;
497 slot_num = ret;
498 s = &slot[slot_num];
499 s->format = format;
500 s->receiver_node = para_calloc(sizeof(struct receiver_node));
501 rn = s->receiver_node;
502 rn->receiver = r;
503 rn->conf = a->receiver_conf;
504 rn->btrn = btr_new_node(r->name, NULL, NULL, rn);
505 ret = r->open(rn);
506 if (ret < 0) {
507 btr_free_node(rn->btrn);
508 free(rn);
509 s->receiver_node = NULL;
510 goto err;
511 }
512 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
513 audio_formats[s->format], r->name, slot_num);
514 rn->task.pre_select = r->pre_select;
515 rn->task.post_select = r->post_select;
516 sprintf(rn->task.status, "%s receiver node", r->name);
517 register_task(&rn->task);
518 ret = slot_num;
519 err:
520 if (ret < 0)
521 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
522 tv_add(now, &restart_delay, &afi[format].restart_barrier);
523 return ret;
524 }
525
526 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
527 static int receiver_running(int format)
528 {
529 int i, ret = 0;
530
531 FOR_EACH_SLOT(i) {
532 struct slot_info *s = &slot[i];
533 if (s->format != format)
534 continue;
535 if (!s->receiver_node)
536 continue;
537 if (s->receiver_node->task.error >= 0)
538 return 1;
539 ret = -1;
540 }
541 return ret;
542 }
543
544 /* returns slot num on success. */
545 static int open_current_receiver(struct sched *s)
546 {
547 struct timeval diff;
548 int ret, cafn = stat_task->current_audio_format_num;
549
550 if (cafn < 0 || !stat_task->ct)
551 return -1;
552 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
553 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
554 return -1;
555 ret = receiver_running(cafn);
556 if (ret > 0) /* already running and not eof */
557 return -1;
558 if (ret < 0) { /* eof */
559 /*
560 * para_server uses a zero start time during the announcement
561 * period, i.e. before it sends the first chunk. Wait until
562 * this period begins to avoid restarting the receiver that
563 * belongs to the file just completed.
564 */
565 PARA_CRIT_LOG("->>>>>>>>>>>>>>>>>> no delay\n");
566 if (stat_task->server_stream_start.tv_sec != 0) {
567 PARA_CRIT_LOG("->>>>>>>>>>>>>>>>>><delay\n");
568 return -1;
569 }
570 }
571 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
572 /* avoid busy loop */
573 s->timeout = diff;
574 return -1;
575 }
576 /* start a new receiver */
577 return open_receiver(cafn);
578 }
579
580 static unsigned compute_time_diff(const struct timeval *status_time)
581 {
582 struct timeval tmp, diff;
583 static unsigned count;
584 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
585 const struct timeval max_deviation = {0, 500 * 1000};
586 const int time_smooth = 5;
587
588 if (!status_time)
589 return count;
590 sign = tv_diff(status_time, now, &diff);
591 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
592 // sign, sa_time_diff_sign);
593 if (!count) {
594 sa_time_diff_sign = sign;
595 stat_task->sa_time_diff = diff;
596 count++;
597 goto out;
598 }
599 if (count > 5) {
600 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
601 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
602 PARA_WARNING_LOG("time diff jump: %lims\n",
603 s * tv2ms(&tmp));
604 }
605 count++;
606 sa_time_diff_sign = tv_convex_combination(
607 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
608 count > 10? sign : sign * time_smooth, &diff,
609 &tmp);
610 stat_task->sa_time_diff = tmp;
611 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
612 sign > 0? "+" : "-",
613 tv2ms(&diff),
614 sa_time_diff_sign ? "+" : "-",
615 tv2ms(&stat_task->sa_time_diff)
616 );
617 out:
618 stat_task->sa_time_diff_sign = sa_time_diff_sign;
619 return count;
620 }
621
622 static int update_item(int itemnum, char *buf)
623 {
624 long unsigned sec, usec;
625
626 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
627 return 1;
628 free(stat_item_values[itemnum]);
629 stat_item_values[itemnum] = para_strdup(buf);
630 stat_client_write_item(itemnum);
631 switch (itemnum) {
632 case SI_STATUS_FLAGS:
633 stat_task->vss_status = 0;
634 if (strchr(buf, 'N'))
635 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
636 if (strchr(buf, 'P'))
637 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
638 break;
639 case SI_OFFSET:
640 stat_task->offset_seconds = atoi(buf);
641 break;
642 case SI_SECONDS_TOTAL:
643 stat_task->length_seconds = atoi(buf);
644 break;
645 case SI_STREAM_START:
646 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
647 struct timeval a_start, delay;
648 delay.tv_sec = conf.stream_delay_arg / 1000;
649 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
650 stat_task->server_stream_start.tv_sec = sec;
651 stat_task->server_stream_start.tv_usec = usec;
652 if (compute_time_diff(NULL) > 2) {
653 if (stat_task->sa_time_diff_sign < 0)
654 tv_add(&stat_task->server_stream_start,
655 &stat_task->sa_time_diff, &a_start);
656 else
657 tv_diff(&stat_task->server_stream_start,
658 &stat_task->sa_time_diff, &a_start);
659 tv_add(&a_start, &delay, &initial_delay_barrier);
660 }
661 }
662 break;
663 case SI_CURRENT_TIME:
664 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
665 struct timeval tv = {sec, usec};
666 compute_time_diff(&tv);
667 }
668 break;
669 case SI_FORMAT:
670 stat_task->current_audio_format_num
671 = get_audio_format_num(buf);
672 }
673 return 1;
674 }
675
676 static int parse_stream_command(const char *txt, char **cmd)
677 {
678 char *p = strchr(txt, ':');
679 int i;
680
681 if (!p)
682 return -E_MISSING_COLON;
683 p++;
684 FOR_EACH_AUDIO_FORMAT(i) {
685 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
686 continue;
687 *cmd = p;
688 return i;
689 }
690 return -E_UNSUPPORTED_AUDIO_FORMAT;
691 }
692
693 static int add_filter(int format, char *cmdline)
694 {
695 struct audio_format_info *a = &afi[format];
696 int filter_num, nf = a->num_filters;
697
698 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
699 if (filter_num < 0)
700 return filter_num;
701 a->filter_nums[nf] = filter_num;
702 a->num_filters++;
703 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
704 filters[filter_num].name);
705 return filter_num;
706 }
707
708 static int parse_writer_args(void)
709 {
710 int i, ret, nw;
711 char *cmd;
712 struct audio_format_info *a;
713
714 nw = PARA_MAX(1U, conf.writer_given);
715 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
716 FOR_EACH_AUDIO_FORMAT(i) {
717 a = &afi[i];
718 a->writer_conf = para_malloc(nw * sizeof(void *));
719 a->writer_nums = para_malloc(nw * sizeof(int));
720 a->num_writers = 0;
721 }
722 for (i = 0; i < conf.writer_given; i++) {
723 void *wconf;
724 int writer_num;
725 ret = parse_stream_command(conf.writer_arg[i], &cmd);
726 if (ret < 0)
727 goto out;
728 a = &afi[ret];
729 nw = a->num_writers;
730 wconf = check_writer_arg(cmd, &writer_num);
731 if (!wconf) {
732 ret = writer_num;
733 goto out;
734 }
735 a->writer_nums[nw] = writer_num;
736 a->writer_conf[nw] = wconf;
737 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
738 nw, writer_names[writer_num]);
739 a->num_writers++;
740 }
741 ret = 1;
742 out:
743 return ret;
744 }
745
746 static int parse_receiver_args(void)
747 {
748 int i, ret, receiver_num;
749 char *cmd = NULL;
750 struct audio_format_info *a;
751
752 for (i = conf.receiver_given - 1; i >= 0; i--) {
753 char *arg = conf.receiver_arg[i];
754 char *recv_arg = strchr(arg, ':');
755 ret = -E_MISSING_COLON;
756 if (!recv_arg)
757 goto out;
758 *recv_arg = '\0';
759 recv_arg++;
760 ret = get_audio_format_num(arg);
761 if (ret < 0)
762 goto out;
763 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
764 if (!afi[ret].receiver_conf) {
765 ret = -E_RECV_SYNTAX;
766 goto out;
767 }
768 afi[ret].receiver = &receivers[receiver_num];
769 }
770 /* use the first available receiver with no arguments
771 * for those audio formats for which no receiver
772 * was specified
773 */
774 cmd = para_strdup(receivers[0].name);
775 FOR_EACH_AUDIO_FORMAT(i) {
776 a = &afi[i];
777 if (a->receiver_conf)
778 continue;
779 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
780 if (!a->receiver_conf)
781 return -E_RECV_SYNTAX;
782 a->receiver = &receivers[receiver_num];
783 }
784 ret = 1;
785 out:
786 free(cmd);
787 return ret;
788 }
789
790 static int init_default_filters(void)
791 {
792 int i, ret = 1;
793
794 FOR_EACH_AUDIO_FORMAT(i) {
795 struct audio_format_info *a = &afi[i];
796 char *tmp;
797 int j;
798
799 if (a->num_filters)
800 continue; /* no default -- nothing to to */
801 /* add "dec" to audio format name */
802 tmp = make_message("%sdec", audio_formats[i]);
803 for (j = 0; filters[j].name; j++)
804 if (!strcmp(tmp, filters[j].name))
805 break;
806 free(tmp);
807 ret = -E_UNSUPPORTED_FILTER;
808 if (!filters[j].name)
809 goto out;
810 tmp = para_strdup(filters[j].name);
811 ret = add_filter(i, tmp);
812 free(tmp);
813 if (ret < 0)
814 goto out;
815 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
816 filters[j].name);
817 }
818 out:
819 return ret;
820 }
821
822 static int parse_filter_args(void)
823 {
824 int i, ret, nf;
825
826 nf = PARA_MAX(1U, conf.filter_given);
827 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
828 FOR_EACH_AUDIO_FORMAT(i) {
829 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
830 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
831 }
832 if (!conf.no_default_filters_given)
833 return init_default_filters();
834 for (i = 0; i < conf.filter_given; i++) {
835 char *arg = conf.filter_arg[i];
836 char *filter_name = strchr(arg, ':');
837 ret = -E_MISSING_COLON;
838 if (!filter_name)
839 goto out;
840 *filter_name = '\0';
841 filter_name++;
842 ret = get_audio_format_num(arg);
843 if (ret < 0)
844 goto out;
845 ret = add_filter(ret, filter_name);
846 if (ret < 0)
847 goto out;
848 }
849 ret = init_default_filters(); /* use default values for the rest */
850 out:
851 return ret;
852 }
853
854 static int parse_stream_args(void)
855 {
856 int ret;
857
858 ret = parse_receiver_args();
859 if (ret < 0)
860 return ret;
861 ret = parse_filter_args();
862 if (ret < 0)
863 return ret;
864 ret = parse_writer_args();
865 if (ret < 0)
866 return ret;
867 return 1;
868 }
869
870 /* does not unlink socket on errors */
871 static int audiod_get_socket(void)
872 {
873 struct sockaddr_un unix_addr;
874 int ret, fd;
875
876 if (conf.socket_given)
877 socket_name = para_strdup(conf.socket_arg);
878 else {
879 char *hn = para_hostname();
880 socket_name = make_message("/var/paraslash/audiod_socket.%s",
881 hn);
882 free(hn);
883 }
884 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
885 if (conf.force_given)
886 unlink(socket_name);
887 ret = create_local_socket(socket_name, &unix_addr,
888 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
889 if (ret < 0)
890 goto err;
891 fd = ret;
892 if (listen(fd , 5) < 0) {
893 ret = -ERRNO_TO_PARA_ERROR(errno);
894 goto err;
895 }
896 ret = mark_fd_nonblocking(fd);
897 if (ret < 0)
898 goto err;
899 return fd;
900 err:
901 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
902 exit(EXIT_FAILURE);
903 }
904
905 static void signal_pre_select(struct sched *s, struct task *t)
906 {
907 struct signal_task *st = container_of(t, struct signal_task, task);
908 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
909 }
910
911 static void signal_post_select(struct sched *s, struct task *t)
912 {
913 struct signal_task *st = container_of(t, struct signal_task, task);
914
915 if (!FD_ISSET(st->fd, &s->rfds))
916 return;
917
918 st->signum = para_next_signal();
919 switch (st->signum) {
920 case SIGINT:
921 case SIGTERM:
922 case SIGHUP:
923 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
924 clean_exit(EXIT_FAILURE, "caught deadly signal");
925 }
926 }
927
928 static void signal_setup_default(struct signal_task *st)
929 {
930 st->task.pre_select = signal_pre_select;
931 st->task.post_select = signal_post_select;
932 sprintf(st->task.status, "signal task");
933 }
934
935 static void command_pre_select(struct sched *s, struct task *t)
936 {
937 struct command_task *ct = container_of(t, struct command_task, task);
938 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
939 }
940
941 static void command_post_select(struct sched *s, struct task *t)
942 {
943 int ret;
944 struct command_task *ct = container_of(t, struct command_task, task);
945 static struct timeval last_status_dump;
946 struct timeval tmp, delay = {0, 500 * 1000};
947
948 tv_add(&last_status_dump, &delay, &tmp);
949 if (tv_diff(&tmp, now, NULL) < 0) {
950 audiod_status_dump();
951 last_status_dump = *now;
952 }
953
954 if (!FD_ISSET(ct->fd, &s->rfds))
955 return;
956 ret = handle_connect(ct->fd);
957 if (ret < 0)
958 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
959 }
960
961 static void init_command_task(struct command_task *ct)
962 {
963 ct->task.pre_select = command_pre_select;
964 ct->task.post_select = command_post_select;
965 ct->task.error = 0;
966 ct->fd = audiod_get_socket(); /* doesn't return on errors */
967 sprintf(ct->task.status, "command task");
968 }
969
970 static void close_stat_pipe(void)
971 {
972 if (!stat_task->ct)
973 return;
974 client_close(stat_task->ct);
975 stat_task->ct = NULL;
976 clear_and_dump_items();
977 stat_task->length_seconds = 0;
978 stat_task->offset_seconds = 0;
979 stat_task->vss_status = 0;
980 stat_task->current_audio_format_num = -1;
981 audiod_status_dump();
982 }
983
984 /**
985 * close the connection to para_server and exit
986 *
987 * \param status the exit status which is passed to exit(3)
988 * \param msg the log message
989 *
990 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
991 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
992 * EXIT_FAILURE.
993 *
994 * \sa exit(3)
995 */
996 void __noreturn clean_exit(int status, const char *msg)
997 {
998 PARA_EMERG_LOG("%s\n", msg);
999 if (socket_name)
1000 unlink(socket_name);
1001 close_stat_pipe();
1002 exit(status);
1003 }
1004
1005 /* avoid busy loop if server is down */
1006 static void set_stat_task_restart_barrier(unsigned seconds)
1007 {
1008 struct timeval delay = {seconds, 0};
1009 tv_add(now, &delay, &stat_task->restart_barrier);
1010 }
1011
1012 static void try_to_close_slot(int slot_num)
1013 {
1014 struct slot_info *s = &slot[slot_num];
1015 struct audio_format_info *a = afi + s->format;
1016 int i;
1017
1018 if (s->format < 0)
1019 return;
1020 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1021 return;
1022 for (i = 0; i < a->num_filters; i++)
1023 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1024 return;
1025 for (i = 0; i < a->num_writers; i++)
1026 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1027 return;
1028 PARA_INFO_LOG("closing slot %d\n", slot_num);
1029 close_writers(s);
1030 _close_filters(s);
1031 close_receiver(slot_num);
1032 clear_slot(slot_num);
1033 }
1034
1035 /*
1036 * Check if any receivers/filters/writers need to be started and do so if
1037 * necessary.
1038 */
1039 static void start_stop_decoders(struct sched *s)
1040 {
1041 int i, ret;
1042 struct slot_info *sl;
1043 struct audio_format_info *a;
1044
1045 FOR_EACH_SLOT(i)
1046 try_to_close_slot(i);
1047 // if (audiod_status != AUDIOD_ON ||
1048 // !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1049 // return kill_all_decoders(-E_NOT_PLAYING);
1050 ret = open_current_receiver(s);
1051 if (ret < 0)
1052 return;
1053 sl = slot + ret;
1054 a = afi + sl->format;
1055 if (a->num_filters)
1056 open_filters(sl);
1057 open_writers(sl);
1058 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1059 s->timeout.tv_sec = 0;
1060 s->timeout.tv_usec = 1;
1061 }
1062
1063 /* restart the client task if necessary */
1064 static void status_pre_select(struct sched *s, struct task *t)
1065 {
1066 struct status_task *st = container_of(t, struct status_task, task);
1067
1068 if (audiod_status == AUDIOD_OFF) {
1069 if (!st->ct)
1070 goto out;
1071 if (st->ct->task.error >= 0) {
1072 st->ct->task.error = -E_AUDIOD_OFF;
1073 goto out;
1074 }
1075 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1076 goto out;
1077 close_stat_pipe();
1078 st->clock_diff_count = conf.clock_diff_count_arg;
1079 goto out;
1080 }
1081 if (st->ct) {
1082 int ret;
1083 if (st->ct->task.error < 0) {
1084 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1085 goto out;
1086 close_stat_pipe();
1087 goto out;
1088 }
1089 if (st->ct->status != CL_RECEIVING)
1090 goto out;
1091 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1092 update_item);
1093 if (ret < 0) {
1094 st->ct->task.error = ret;
1095 goto out;
1096 }
1097 if (st->ct->loaded != ret) {
1098 st->last_status_read = *now;
1099 st->ct->loaded = ret;
1100 } else {
1101 struct timeval diff;
1102 tv_diff(now, &st->last_status_read, &diff);
1103 if (diff.tv_sec > 61)
1104 st->ct->task.error = -E_STATUS_TIMEOUT;
1105 }
1106 goto out;
1107 }
1108 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1109 goto out;
1110 if (st->clock_diff_count) { /* get status only one time */
1111 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1112 int argc = 5;
1113 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1114 st->clock_diff_count--;
1115 client_open(argc, argv, &st->ct, NULL);
1116 set_stat_task_restart_barrier(2);
1117
1118 } else {
1119 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1120 int argc = 4;
1121 client_open(argc, argv, &st->ct, NULL);
1122 set_stat_task_restart_barrier(5);
1123 }
1124 free(stat_item_values[SI_BASENAME]);
1125 stat_item_values[SI_BASENAME] = para_strdup(
1126 "no connection to para_server");
1127 stat_client_write_item(SI_BASENAME);
1128 st->last_status_read = *now;
1129 out:
1130 start_stop_decoders(s);
1131 }
1132
1133 static void init_status_task(struct status_task *st)
1134 {
1135 memset(st, 0, sizeof(struct status_task));
1136 st->task.pre_select = status_pre_select;
1137 st->sa_time_diff_sign = 1;
1138 st->clock_diff_count = conf.clock_diff_count_arg;
1139 st->current_audio_format_num = -1;
1140 sprintf(st->task.status, "status task");
1141 }
1142
1143 static void set_initial_status(void)
1144 {
1145 audiod_status = AUDIOD_ON;
1146 if (!conf.mode_given)
1147 return;
1148 if (!strcmp(conf.mode_arg, "sb")) {
1149 audiod_status = AUDIOD_STANDBY;
1150 return;
1151 }
1152 if (!strcmp(conf.mode_arg, "off")) {
1153 audiod_status = AUDIOD_OFF;
1154 return;
1155 }
1156 if (strcmp(conf.mode_arg, "on"))
1157 PARA_WARNING_LOG("invalid mode\n");
1158 }
1159
1160 __noreturn static void print_help_and_die(void)
1161 {
1162 int d = conf.detailed_help_given;
1163 const char **p = d? audiod_args_info_detailed_help
1164 : audiod_args_info_help;
1165
1166 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1167 AUDIOD_CMDLINE_PARSER_VERSION);
1168 printf_or_die("%s\n\n", audiod_args_info_usage);
1169 for (; *p; p++)
1170 printf_or_die("%s\n", *p);
1171 print_receiver_helps(d);
1172 print_filter_helps(d);
1173 print_writer_helps(d);
1174 exit(0);
1175 }
1176
1177 static void init_colors_or_die(void)
1178 {
1179 int ret, i;
1180
1181 if (!want_colors())
1182 return;
1183 daemon_set_default_log_colors();
1184 daemon_set_flag(DF_COLOR_LOG);
1185 for (i = 0; i < conf.log_color_given; i++) {
1186 ret = daemon_set_log_color(conf.log_color_arg[i]);
1187 if (ret < 0)
1188 exit(EXIT_FAILURE);
1189 }
1190 }
1191
1192 /**
1193 * the main function of para_audiod
1194 *
1195 * \param argc usual argument count
1196 * \param argv usual argument vector
1197 *
1198 * \return EXIT_SUCCESS or EXIT_FAILURE
1199 *
1200 * \sa para_audiod(1)
1201 * */
1202 int main(int argc, char *argv[])
1203 {
1204 int ret, i;
1205 static struct sched s;
1206 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1207 struct audiod_cmdline_parser_params params = {
1208 .override = 0,
1209 .initialize = 1,
1210 .check_required = 0,
1211 .check_ambiguity = 0,
1212 .print_errors = 1
1213 };
1214
1215 valid_fd_012();
1216 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1217 exit(EXIT_FAILURE);
1218 HANDLE_VERSION_FLAG("audiod", conf);
1219 /* init receivers/filters/writers early to make help work */
1220 recv_init();
1221 filter_init();
1222 writer_init();
1223 if (conf.help_given || conf.detailed_help_given)
1224 print_help_and_die();
1225 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1226 parse_config_or_die();
1227 init_colors_or_die();
1228 init_random_seed_or_die();
1229 daemon_set_flag(DF_LOG_TIME);
1230 daemon_set_flag(DF_LOG_HOSTNAME);
1231 daemon_set_flag(DF_LOG_LL);
1232 if (conf.log_timing_given)
1233 daemon_set_flag(DF_LOG_TIMING);
1234 if (conf.logfile_given) {
1235 daemon_set_logfile(conf.logfile_arg);
1236 daemon_open_log_or_die();
1237 }
1238 ret = parse_stream_args();
1239 if (ret < 0) {
1240 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1241 exit(EXIT_FAILURE);
1242 }
1243 log_welcome("para_audiod");
1244 server_uptime(UPTIME_SET);
1245 set_initial_status();
1246 FOR_EACH_SLOT(i)
1247 clear_slot(i);
1248 init_grabbing();
1249 setup_signal_handling();
1250 signal_setup_default(sig_task);
1251
1252 init_status_task(stat_task);
1253 init_command_task(cmd_task);
1254
1255 if (conf.daemon_given)
1256 daemonize();
1257
1258 register_task(&sig_task->task);
1259 register_task(&cmd_task->task);
1260 register_task(&stat_task->task);
1261 s.default_timeout.tv_sec = 2;
1262 s.default_timeout.tv_usec = 999 * 1000;
1263 ret = schedule(&s);
1264
1265 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1266 return EXIT_FAILURE;
1267 }